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发明名称
Schallaufnahmegeraet mit Zwischenreflektoren zur Schalluebertragung von dem Aufnahmemittel zur Hoerstelle
摘要
申请公布号
DE586441(C)
申请公布日期
1933.10.21
申请号
DENDATR018959D
申请日期
申请人
DR. ERICH SCHUMANN
发明人
分类号
G10K11/28
主分类号
G10K11/28
代理机构
代理人
主权项
地址
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